/*
 * linux/include/linux/sunrpc/auth.h
 *
 * Declarations for the RPC client authentication machinery.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#ifndef _LINUX_SUNRPC_AUTH_H
#define _LINUX_SUNRPC_AUTH_H

#ifdef __KERNEL__

#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/sunrpc/xdr.h>

#include <asm/atomic.h>
#include <linux/rcupdate.h>

/* size of the nodename buffer */
#define UNX_MAXNODENAME	32

/* Work around the lack of a VFS credential */
struct auth_cred {
	uid_t uid;
	gid_t gid;
	struct group_info *group_info;
	unsigned char machine_cred:1;
};

/*
 * Client user credentials
 */
struct rpc_auth;
struct rpc_credops;
struct rpc_cred {
	struct hlist_node cr_hash;	/* hash chain */
	struct list_head cr_lru;	/* lru garbage collection */
	struct rcu_head cr_rcu;
	struct rpc_auth *cr_auth;
	const struct rpc_credops *cr_ops;
#ifdef RPC_DEBUG
	unsigned long cr_magic;	/* 0x0f4aa4f0 */
#endif
	unsigned long cr_expire;	/* when to gc */
	unsigned long cr_flags;	/* various flags */
	atomic_t cr_count;	/* ref count */

	uid_t cr_uid;

	/* per-flavor data */
};
#define RPCAUTH_CRED_NEW	0
#define RPCAUTH_CRED_UPTODATE	1
#define RPCAUTH_CRED_HASHED	2

#define RPCAUTH_CRED_MAGIC	0x0f4aa4f0

/*
 * Client authentication handle
 */
#define RPC_CREDCACHE_HASHBITS	4
#define RPC_CREDCACHE_NR	(1 << RPC_CREDCACHE_HASHBITS)
struct rpc_cred_cache {
	struct hlist_head hashtable[RPC_CREDCACHE_NR];
	spinlock_t lock;
};

struct rpc_authops;
struct rpc_auth {
	unsigned int au_cslack;	/* call cred size estimate */
	/* guess at number of u32's auth adds before
	 * reply data; normally the verifier size: */
	unsigned int au_rslack;
	/* for gss, used to calculate au_rslack: */
	unsigned int au_verfsize;

	unsigned int au_flags;	/* various flags */
	const struct rpc_authops *au_ops;	/* operations */
	rpc_authflavor_t au_flavor;	/* pseudoflavor (note may
					 * differ from the flavor in
					 * au_ops->au_flavor in gss
					 * case) */
	atomic_t au_count;	/* Reference counter */

	struct rpc_cred_cache *au_credcache;
	/* per-flavor data */
};

/* Flags for rpcauth_lookupcred() */
#define RPCAUTH_LOOKUP_NEW		0x01	/* Accept an uninitialised cred */

/*
 * Client authentication ops
 */
struct rpc_authops {
	struct module *owner;
	rpc_authflavor_t au_flavor;	/* flavor (RPC_AUTH_*) */
	char *au_name;
	struct rpc_auth *(*create) (struct rpc_clnt *, rpc_authflavor_t);
	void (*destroy) (struct rpc_auth *);

	struct rpc_cred *(*lookup_cred) (struct rpc_auth *, struct auth_cred *,
					 int);
	struct rpc_cred *(*crcreate) (struct rpc_auth *, struct auth_cred *,
				      int);
};

struct rpc_credops {
	const char *cr_name;	/* Name of the auth flavour */
	int (*cr_init) (struct rpc_auth *, struct rpc_cred *);
	void (*crdestroy) (struct rpc_cred *);

	int (*crmatch) (struct auth_cred *, struct rpc_cred *, int);
	void (*crbind) (struct rpc_task *, struct rpc_cred *);
	__be32 *(*crmarshal) (struct rpc_task *, __be32 *);
	int (*crrefresh) (struct rpc_task *);
	__be32 *(*crvalidate) (struct rpc_task *, __be32 *);
	int (*crwrap_req) (struct rpc_task *, kxdrproc_t,
			   void *, __be32 *, void *);
	int (*crunwrap_resp) (struct rpc_task *, kxdrproc_t,
			      void *, __be32 *, void *);
};

extern const struct rpc_authops authunix_ops;
extern const struct rpc_authops authnull_ops;

void __init rpc_init_authunix(void);
void __init rpc_init_generic_auth(void);
void __init rpcauth_init_module(void);
void __exit rpcauth_remove_module(void);
void __exit rpc_destroy_generic_auth(void);

struct rpc_cred *rpc_lookup_cred(void);
struct rpc_cred *rpc_lookup_machine_cred(void);
int rpcauth_register(const struct rpc_authops *);
int rpcauth_unregister(const struct rpc_authops *);
struct rpc_auth *rpcauth_create(rpc_authflavor_t, struct rpc_clnt *);
void rpcauth_release(struct rpc_auth *);
struct rpc_cred *rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *,
					  int);
void rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *,
		       struct rpc_auth *, const struct rpc_credops *);
struct rpc_cred *rpcauth_lookupcred(struct rpc_auth *, int);
void rpcauth_bindcred(struct rpc_task *, struct rpc_cred *, int);
void rpcauth_generic_bind_cred(struct rpc_task *, struct rpc_cred *);
void put_rpccred(struct rpc_cred *);
void rpcauth_unbindcred(struct rpc_task *);
__be32 *rpcauth_marshcred(struct rpc_task *, __be32 *);
__be32 *rpcauth_checkverf(struct rpc_task *, __be32 *);
int rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp,
		     __be32 * data, void *obj);
int rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp,
			__be32 * data, void *obj);
int rpcauth_refreshcred(struct rpc_task *);
void rpcauth_invalcred(struct rpc_task *);
int rpcauth_uptodatecred(struct rpc_task *);
int rpcauth_init_credcache(struct rpc_auth *);
void rpcauth_destroy_credcache(struct rpc_auth *);
void rpcauth_clear_credcache(struct rpc_cred_cache *);

static inline struct rpc_cred *get_rpccred(struct rpc_cred *cred)
{
	atomic_inc(&cred->cr_count);
	return cred;
}

#endif /* __KERNEL__ */
#endif /* _LINUX_SUNRPC_AUTH_H */
